2004 Water Quality Report Addendum
(2003) Yearly Tap Averages

The following is a comprehensive list of the parameters the District monitored in the drinking water.  Most of them were not required to be reported by EPA's Consumer Confidence Rule in the above Drinking Water Quality Report because the parameters were either not detected in the water or, if they were detected there are no regulations or health risks associated with the parameters.
All Concentrations are in "mg/L" or "parts per million" unless stated otherwise.
Measurements performed at the "Entry Point to the Distribution System" unless stated otherwise.
REGULATED 
Disinfectants
Disinfection By-Products
Disinfection By-Product Precursors
Inorganics, including heavy metals
Microbiological / Physical
Radionuclides
Synthetic Organic Compounds
Volatile Organic Compounds
Secondary Standards
UNREGULATED
Additional Tests
Haloacetic Acids (HAA's) -- Individual Listing
Microbiological/Physical
No Standards
Polychlorinated biphenyls (PCB's)
Synthetic Organic Compounds
Total Trihalomethanes (T-THM's) - Individual Listing
Volatile Organic Compounds
Regulated
 
Disinfectants
(Values in mg/L)
Parameter MRDL WD#1 Level
Chloramines < 4.0 2.55
Chlorine Dioxide < 0.8 ND(0.02)
MRDL = Maximum Residual Disinfectant Level (back to the top)
     
Disinfection By-Products
Parameter MCL WD#1 Level
Chlorite 1.0 < 0.1
Haloacetic Acids (HAA5) 0.06 0.011
Total Trihalomethanes (T-THMs) 0.08 0.015
(back to the top)    
Disinfection By-Product Precursors
Parameter MCL WD#1 Level
Total Organic Carbon (TOC) TT 2.3 (45% Reduction)
UV254 Absorbance TT 0.05 *
* Absorbance Units (back to the top)  
Inorganics, including Heavy Metals
(Values in parts per million)
Parameter MCL WD#1 Level
Antimony 0.006 ND(0.001)
Arsenic 0.05 ND(0.001)
Asbestos (Fiber > 10 microns) 7 MFL* ND
Barium 2 0.025
Beryllium 0.004 ND(0.001)
Cadmium 0.005 ND(0.001)
Chromium (Total) 0.1 0.001
Copper 1.3 ND(0.018)
Cyanide 0.2 ND(0.01)
Fluoride 4 0.72
Lead 0.005** ND(0.001)
Mercury (Inorganic) 0.002 ND(0.0002)
Nitrate 10 0.88
Nitrite 1 ND(0.05)
Selenium 0.05 0.005
Thallium 0.002 ND(0.002)
*   MFL - Million Fibers per Liter
** This MCL is applicable at the "Entry Point to the Distribution System" only. (back to the top)
Microbiological / Physical
Parameter MCL WD#1 Level
Total Coliforms <1/100 ml in 95% of samples 0.01%
Fecal Coliforms <1/100 ml in 100% of samples ND
Escherichia coli (E. coli) <1/100 ml in 100% of samples ND
Turbidity (filtration) <0.3 NTU in 95% of samples 0.06 NTU
Disinfection C.T. Ratio > 1.0 3.0
Giardia TT ND *
Cryptosporidium TT ND *
* Not Detected @ < 0.24 cysts or oocysts / 100L  (back to the top)
Radionuclides
(Values in pCi/L)
Parameter MCL WD#1 Level
Gross Alpha Particle Activity 15 ND(2.6)
Beta Particle & Photon Radioactivity * 50 5.4
Radium 226, 228 (combined) 5 ND(0.6)
Value in part per billion (ppb)
Uranium 30 ** 3
* EPA considers 50 pCi/L to be the level of concern for beta particles.
** As of 12/08/03 (back to the top)
     
Synthetic Organic Compounds
Values in parts per million (ppm)
Parameter MCL WD#1 Level
Alachlor 0.002 ND(0.0002)
Atrazine 0.003 0.0001
Benzo(a)pyrene (PAH's) 0.0002 ND(0.00004)
Carbofuran 0.04 ND(0.0015)
Chlordane 0.002 ND(0.0002)
Dalapon 0.2 ND(0.020)
Di-2(ethylhexyl)adipate 0.4 ND(0.005)
Di-2(ethylhexyl)phthalate 0.006 ND(0.0007)
Dibromochloropropane (DBCP) 0.0002 ND(0.00001)
Dinoseb 0.007 ND(0.001)
Diquat 0.02 ND(0.0004)
Dioxin (2,3,7,8 - TCDD)